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MathAngel369

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Learn Trigonometry, Calculus I, II, III, Linear Algebra, and Advanced Linear Algebra! MathAngel369 is an educational mathematics resource created by Angela Morgan to make learning mathematics accessible to everyone. Choose the learning method that works best for you: YouTube videos, blog discussions, or step-by-step math lessons!

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Category: Precalculus Trigonometry

Posted on May 19, 2022July 14, 2022

Prove that a Trig Equation is NOT an Identity.

Posted on May 15, 2022June 20, 2022

How to Use the Product-to-Sum Identities to Rewrite Trig Expressions

Posted on May 11, 2022May 11, 2022

Using the Sum-to-Product Identities to Solve Trig Equations

Posted on May 4, 2022May 7, 2022

Proving the Product-to-Sum Formulas

Posted on April 3, 2022May 4, 2022

Proving the Sum-to-Product Formulas for Cosine

Posted on March 16, 2022May 11, 2022

Proving the Sum-to-Product Formulas for Sine

Posted on February 27, 2022March 16, 2022

Using Half-Angel Identities to Find the Exact Value of Trig Expressions

Posted on February 17, 2022February 22, 2022

Proving the Power-Reducing and Half-Angle Trig Identities

Posted on February 10, 2022February 17, 2022

Using the Double-Angle Identities to Verify Other Trig Identities

Posted on January 31, 2022February 12, 2022

Proving the Double-Angle Trig Identities for Sine, Cosine, and Tangent

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